Virtual image display device and optical unit

Abstract

A virtual image display device includes an image light generation device generating image light, a transmissive tilted mirror reflecting the image light from the image light generation device, and a concave transmissive mirror having a concave shape and reflecting, toward the transmissive tilted mirror, the image light reflected by the transmissive tilted mirror to form an exit pupil. The virtual image display device further includes an absorber layer or an absorption film on an external side of a transmissive reflective surface formed in the concave transmissive mirror.

What is claimed is: 
     
       1. A virtual image display device comprising:
 an image light generation device generating image light; 
 a first mirror reflecting the image light from the image light generation device; and 
 a second mirror having a concave shape and reflecting, toward the first mirror, the image light reflected by the first mirror; 
 wherein the second mirror includes a transmissive member, a first reflection member, an absorption member, 
 the transmissive member includes a first surface and a second surface opposing to the first surface, 
 the first reflection member on which the image light reflected by the first mirror is incident, the first reflection member is provided along the first surface of the transmissive member, the first reflection surface reflects a part of the image light and transmits other part of the image light, 
 the absorption member absorbs other part of the image light, the absorption member is provided along the second surface of the transmissive member. 
 
     
     
       2. The virtual image display device according to  claim 1 , wherein the absorption member absorbs the image through the first reflection surface. 
     
     
       3. The virtual image display device according to  claim 2 , wherein the second mirror includes a second reflection member reflecting a part of the image light and transmitting other part of the image,
 the absorption member is provided between the transmissive member and the second reflection member. 
 
     
     
       4. The virtual image display device according to  claim 1 , wherein the absorption member is spaced apart from the first reflection member. 
     
     
       5. The virtual image display device according to  claim 1 , wherein the absorption includes a first absorber layer and a first absorption film,
 the first absorber layer absorbs the image light through the first reflection surface, 
 the first absorption film absorbs the image light through the first absorber layer. 
 
     
     
       6. The virtual image display device according to  claim 1 , wherein the second mirror reflects the image light toward the first mirror to form an exit pupil. 
     
     
       7. The virtual image display device according to  claim 1 , comprising a shade spaced apart from the second mirror,
 the second mirror is disposed between the first mirror and the shade. 
 
     
     
       8. The virtual image display device according to  claim 7 , wherein the shade includes a second absorber layer or a second absorption film. 
     
     
       9. The virtual image display device according to  claim 8 , wherein the shade covers the absorption member. 
     
     
       10. The virtual image display device according to  claim 1 , wherein the second mirror has a thickness of 2 mm or smaller. 
     
     
       11. The virtual image display device according to  claim 1 , wherein an emission light axis extends from the first mirror toward the second mirror is inclined to downward direction with respect to a horizontal axis. 
     
     
       12. The virtual image display device according to  claim 1 , wherein the second mirror includes an anti-reflective film,
 the absorption member is provided between the transmissive member and the anti-reflective film. 
 
     
     
       13. The virtual image display device according to  claim 1 , further comprising a third mirror reflecting, to an intersection direction, the image light from the image light generation device. 
     
     
       14. The virtual image display device according to  claim 1 , further comprising a projection optical system disposed between the image light generation device and the first mirror and forming an intermediate image. 
     
     
       15. The virtual image display device according to  claim 1 , wherein the image light is entered to the second mirror without forming an intermediate image. 
     
     
       16. An optical unit comprising:
 a first mirror reflecting image light; and 
 a second mirror having a concave shape and reflecting, toward the first mirror, the image light reflected by the first mirror; 
 wherein 
 the second mirror includes a transmissive member, a first reflection member, an absorption member, 
 the transmissive member includes a first surface and a second surface opposing to the first surface, 
 the first reflection member on which the image light reflected by the first mirror is incident, the first reflection member is provided along the first surface of the transmissive member, the first reflection member reflects a part of the image light and transmits other part of the image light, 
 the absorption member absorbs other part of the image light, the absorption member is provided along the second surface of the transmissive member.